Multiple Choice
Why is Venus hotter than Mercury despite being further from the Sun?
7. Gases
The Ideal Gas Law
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Which of the following statements accurately describes the seasonal variation of CO2 concentrations in the atmosphere over the course of a year?
A
CO2 concentrations are higher in the summer and lower in the winter.
B
CO2 concentrations decrease steadily throughout the year.
C
CO2 concentrations are higher in the winter and lower in the summer.
D
CO2 concentrations remain constant throughout the year.
Verified step by step guidance1
Understand the role of photosynthesis and respiration in CO2 levels: During the growing season (spring and summer), plants absorb more CO2 for photosynthesis, reducing atmospheric CO2 levels.
Recognize the impact of plant dormancy: In the fall and winter, many plants enter a dormant state, reducing photosynthesis and allowing CO2 levels to rise due to continued respiration and human activities.
Consider the global carbon cycle: The seasonal variation is more pronounced in the Northern Hemisphere due to its larger landmass and greater vegetation compared to the Southern Hemisphere.
Analyze data trends: Observational data from monitoring stations, like the Mauna Loa Observatory, show a clear pattern of CO2 levels peaking in late winter and reaching a minimum in late summer.
Conclude with the correct statement: Based on the understanding of these processes, CO2 concentrations are indeed higher in the winter and lower in the summer, aligning with the correct answer provided.
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